Bateman is 6-under-par today through 15 holes and is at 10-under for the tournament.
Josh Geary started with a birdie blitz and is the best of the other New Zealanders at 9-under.
Australian golfer Jordan Zunic has opened with an eagle and a birdie and shares the lead at 12-under with overnight leader David Bransdon.
Leading New Zealand hope Ryan Fox carded a 69 today but, at 6-under for the tournament, has too much ground to make up.
Arrowtown has turned on a glorious day and The Hills course is swarming with fans.